9 Step Resin Bound Driveway Install with SureSet Aggregate Over a 28-Square-Metre Apron

Start With Moisture, Temperature, and Humidity

Substrate moisture above 5 percent is the reading that should stop a SureSet pour before the first kit is opened. A Protimeter or equivalent pin meter pressed into the existing concrete or tarmac base gives a practical reading that can be checked against the working threshold most installers use: below 5 percent surface moisture.

SureSet’s technical data sheet for its UVR resin specifies that the surface must be dry to touch and free of standing water. On a 28-square-metre apron, take readings at three or four points across the area, including the approach, the centre, and any zone that holds shade or drains slowly.

New concrete adds another risk. A freshly laid slab needs a minimum of 21 days of cure before resin bound surfacing goes down. Power-floated concrete can form a sealed skin that traps laitance and moisture below the top face, so a surface that feels dry can still carry water a couple of millimetres down.

The working temperature range remains 5C to 25C. A falling humidity trend across the working window is safer than air that is moving toward overnight dew, because the resin’s amine cure reacts badly when surface water arrives early. The visible result can be a milky bloom, followed by weak interparticle bonds and loose stone in the first frost cycle.

A correctly primed and dry base gives this type of apron a realistic 10 to 15 years before any meaningful refresh. Early failures across resin bound installations often trace back to moisture readings taken at too few points, with one dry patch masking a wetter part of the same base.

Set the Edge and Count the Kits

Mechanical edge restraint comes before aggregate. Resin bound surfacing has effectively zero lateral strength, so an open edge can creep outward under tyre load. The perimeter needs an existing kerb, a galvanised or aluminium trim, or a haunched concrete upstand.

Set the trim to the finished level and allow for an 18mm laid depth where vehicles will use the driveway. Pedestrian-only areas can be laid at 15mm, while a surface carrying a family car should hold to 18mm minimum. That depth is what fixes the material order.

One standard SureSet kit laid at 18mm covers roughly 2.4 to 2.6 square metres, depending on aggregate grading. A 28-square-metre apron therefore falls between 11 and 12 kits. Ordering 12 gives a spare margin and avoids a shortage during a continuous pour.

Each kit pairs a 25kg bag of kiln-dried, washed stone with measured resin components A and B. Common aggregate sizes are 1-3mm and 2-5mm blends, including colours such as Bavarian Quartz and Autumn Gold.

Primer is essential on non-porous bases. A polyurethane primer rolled across power-floated concrete or sound tarmac gives the resin a chemical key it cannot get from a sealed surface alone. The first batch should go down while the primer is tacky, after the wet sheen has gone.

At 15C, that tack window may be only 20 to 40 minutes after rolling. If the primer cures fully before the first mix is placed, the resin bonds to a cured film with no useful mechanical interlock. That interface becomes a delamination plane when heat builds through a hot August day.

Mix Only What the Pot Life Allows

Forced-action mixers are required for a consistent SureSet blend. A Baron or Belle forced-action paddle mixer coats every stone evenly in three to four minutes per kit.

A free-fall drum mixer gives uneven resin distribution. Resin can pool at the base while stone at the top stays dry, and the finished surface usually reveals that variation within a season.

Pour resin part B into part A and mix the two components for the time stated on the data sheet. Add the kiln-dried aggregate only after the resin components have combined. Run the paddle until every stone glistens, with no dry patches and no liquid resin sliding free.

The pot life clock starts when parts A and B meet. At 20C, the mixed resin usually gives roughly 20 to 30 minutes before it stiffens past clean trowelling. At 10C the working time stretches; above 25C it can shrink quickly enough for a slow wheelbarrow run across the apron to leave a setting mass in the mixer.

This is why the job is run as continuous batches with no gaps between mixes. One batch follows the next while the leading edge remains live enough to accept the lap from the following load.

A cold joint forms when a batch has gone off before the next one meets it. It remains visible as a line and acts as a weak seam for the life of the surface.

Keep the Trowel Clean

A stainless steel finishing trowel kept clean with denatured alcohol or a specialist resin-release spray will glide without dragging aggregate out of line. A dirty or bare-steel trowel pulls resin into ridges and leaves trowel chatter that later cleaning will not hide.

Lay to Depth, Close the Surface, and Decide Drainage

Tip each mixed batch onto the primed base and spread it to the 18mm gauge with the trowel held at a low angle. Simple 18mm spacer blocks set against the edge trim work as depth gauges. They stop the slow drift toward a thin centre that can happen when the eye judges level across 28 square metres.

Work from the far edge back toward the exit. That route keeps finished material out from underfoot and leaves each new batch to feather into the wet leading edge of the previous one. The apron should read as one continuous pour once the surface is closed.

Hold the trowel almost flat and make long, light passes to bring a fine film of resin to the top. That film gives resin bound its tight, sealed appearance, distinct from the rougher resin-bonded finish produced when loose stone is scattered over a tacky base.

Two or three finishing passes are usually enough. A dozen passes can burnish the surface dull and pull too much resin upward, where yellowing under UV becomes more visible. Keep release agent on the trowel between passes, then leave the surface alone once it has knitted.

Drainage depends on the base chosen before any resin was mixed. Resin bound laid over a permeable base such as open-graded asphalt or no-fines concrete lets water pass through the surface itself. That permeability is why it often sidesteps the planning constraints that apply to impermeable front gardens in England and Wales under SuDS guidance.

When resin bound is laid over sealed concrete, water sheds across the finished surface to falls and a channel drain. The surface may look the same from above, yet the planning and drainage position has already been set by the base beneath it.

Cure Time Before Foot Traffic and Vehicles

At 20C, foot traffic can usually return after roughly 4 to 6 hours. Vehicle traffic waits a full 24 to 48 hours, with longer curing needed in cold or damp conditions because the amine cure slows as temperature drops.

A surface can feel firm enough to walk on while the resin matrix has not reached vehicle strength. Driving on it too soon presses stone into a weak matrix and leaves tyre tracks that never lift.

Rain during the first few hours attacks the same curing chemistry that made the opening moisture checks necessary. A settled dry forecast for the pour day and the following night has to be treated as part of the working conditions, because the installer has no useful correction once water reaches a fresh surface. The unresolved point is how much faith to place in a forecast that changes after the resin is already down.